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Rifle Parts

Whether you're building a new rifle from scratch or looking to upgrade an existing firearm, our vast selection of rifle parts has everything you are going to need in that journey. At Rainier Arms' selection of rifle parts, you can find a wide variety of products including lower and upper parts, trigger parts, muzzle devices, and many more. 

Explore our selection of high-quality parts coming from various leading manufacturers like Strike Industries, Magpul, BCM, and many more.

Also, don't forget to check our specially-made Rainier Arms barrels for your firearms.

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  3. ERGO 4 Slot M-LOK Slot Cover 4 Pack
    ERGO 4 Slot M-LOK Slot Cover 4 Pack
    Out of stock
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  4. Magpul Ladder Style Rail Protector
    Magpul Ladder Style Rail Protector
    Out of stock
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  5. Magpul Rail Cover M-LOK Type 1
    Magpul Rail Cover M-LOK Type 1
    Out of stock
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  6. Magpul M-LOK Aluminum Rail Section
    Magpul M-LOK Aluminum Rail Section
    Out of stock
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  7. Hera Arms AR15 Grip
    Hera Arms AR15 Grip
    Out of stock
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  9. Ascalon Arms CZ Scorpion EVO 3/3+ Receiver Shim
    Ascalon Arms CZ Scorpion EVO 3/3+ Receiver Shim
    $17.40
    Out of stock
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  10. Elftmann Tactical AR-15 Non-Rotational Anti-Walk Pins
    Elftmann Tactical AR-15 Non-Rotational Anti-Walk Pins
    $19.95
    Out of stock
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  11. V Seven Weapon Systems Port Door Rod AR10
    V Seven Weapon Systems Port Door Rod AR10
    $13.58
    Out of stock
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  12. Arms Republic M-LOK Rail - 5-Slot
    Arms Republic M-LOK Rail - 5-Slot
    $12.30
    Out of stock
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  13. KNS Precision Perma Pin
    KNS Precision Perma Pin
    $10.00
    Out of stock
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  15. V Seven Weapon Systems AR-15 Port Door Straight Rod
    V Seven Weapon Systems AR-15 Port Door Straight Rod
    $13.58
    Out of stock
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Items 113-128 of 136

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Barrel Length
  1. 18" 2 items
Caliber
  1. .223/5.56 1 item
  2. .308 1 item
Category
  1. Parts & Kits 44 items
  2. Buffer Systems 6 items
  3. Trigger Parts 9 items
  4. Gas Systems 5 items
  5. Muzzle Devices 1 item
  6. Bolt Parts 2 items
  7. Grips 37 items
  8. Charging Handles 1 item
  9. Rifle Handguards 13 items
  10. Stocks & Braces 8 items
  11. MILSPEC Parts 5 items
Color
Configuration
  1. AR-15 2 items
  2. Cross 1 item
  3. Flaming Pig 1 item
  4. Ghetto Blaster 1 item
  5. M-LOK 1 item
  6. Rifle 1 item
Finish
  1. Black 4 items
  2. FDE 2 items
  3. NiB-X 2 items
  4. Nitride 1 item
  5. Nitromet 3 items
Gas Block Diameter
  1. .750" 1 item
Gas System Length
  1. Pistol -1 2 items
  2. Pistol 3 items
  3. Carbine 4 items
  4. Micro 1 item
  5. Mid 3 items
  6. Intermediate 5 items
  7. Patrol 1 item
  8. Rifle 3 items
  9. Rifle +1 2 items
  10. Rifle +2 2 items
Height
  1. Low 1 item
  2. Medium 1 item
  3. High 1 item
Magazine Capacity
  1. 32rd 1 item
Manufacturer
  1. A3 Tactical 1 item
  2. Advanced Armament Company (AAC) 1 item
  3. Aero Precision 1 item
  4. ALG Defense 1 item
  5. Andro Corp Industries 1 item
  6. Armaspec 2 items
  7. Arms Republic 2 items
  8. Ascalon Arms 1 item
  9. B5 Systems 6 items
  10. Battle Arms Development 9 items
  11. Blitzkrieg Components 4 items
  12. Bravo Company MFG (BCM) 8 items
  13. Brigand Arms 1 item
  14. Chisel Machining 1 item
  15. Die Free Co 1 item
  16. Drew Meyers Defense 1 item
  17. Elftmann Tactical 1 item
  18. Ergo Grips 1 item
  19. Flatline Fiber Co 1 item
  20. Fortis MFG 2 items
  21. Forward Controls Design 4 items
  22. Gear Head Works 1 item
  23. Geissele 1 item
  24. Griffin Armament 1 item
  25. HB Industries 1 item
  26. HERA ARMS 1 item
  27. James Madison Tactical (JMT) 1 item
  28. JP Enterprises Inc 2 items
  29. KNS Precision 2 items
  30. Krebs Customs 1 item
  31. Leitner-Wise 1 item
  32. Magpul Industries 21 items
  33. Mission First Tactical 1 item
  34. NEMO Arms 1 item
  35. Neverwear Springs 1 item
  36. Noveske 2 items
  37. Obsidian Arms 1 item
  38. Patriot Ordnance Factory (POF) 1 item
  39. Rainier Arms, LLC 3 items
  40. Rainier Industries 1 item
  41. Reptilia Corp 3 items
  42. Riflespeed 1 item
  43. Rise Armament 1 item
  44. Seekins Precision 1 item
  45. Sprinco (Tactical Springs) 4 items
  46. Strike Industries 10 items
  47. Tango Down 1 item
  48. Taran Tactical Innovations 1 item
  49. TruCalibre 1 item
  50. True North Concepts 4 items
  51. Underground Tactical 1 item
  52. V Seven Weapon Systems 5 items
  53. WMD Guns 4 items
Model
  1. CZ Scorpion 2 items
Mount
  1. M-LOK 14 items
  2. Other 1 item
  3. Picatinny 8 items
Option
  1. AR-10 2 items
  2. AR-15 9 items
  3. White - Standard Power 1 item
  4. Blue - Enhanced Power 1 item
  5. Red - Extra Power 1 item
  6. Orange - Extra Extra Power 1 item
  7. Yellow - Reduced Power 1 item
  8. White/Red - Intermediate Power 1 item
  9. Green - Rifle Length Standard Power 1 item
  10. CZ 1 item
  11. Non-Adjustable 1 item
  12. Dimpled 2 items
  13. Serrated 2 items
Platform
  1. AR-15 4 items
  2. AK47/74 4 items
  3. CZ 2 items
Product Type
  1. Accessory 1 item
  2. Angled Grip 3 items
  3. Anti Walk Pins 5 items
  4. Bolt Catch 4 items
  5. Brace Strap 1 item
  6. Buffer 5 items
  7. Buffer Spring 2 items
  8. Cam Pin 1 item
  9. Castle Nut 1 item
  10. Charging Handle 1 item
  11. Cheek Riser 2 items
  12. Dust Cover 5 items
  13. End Plate 5 items
  14. Firing Pin 1 item
  15. Forearm Accesory 7 items
  16. Gas Block 1 item
  17. Gas Tube 4 items
  18. Grip Accessory 4 items
  19. Grip Module 1 item
  20. Grip Screw 1 item
  21. Handstop 7 items
  22. Lower Parts Kit 1 item
  23. Magazine 1 item
  24. Magazine Catch 2 items
  25. Magazine Release 5 items
  26. Parts Kit 2 items
  27. Pistol Grip 16 items
  28. Port Door 2 items
  29. Port Door Rod 3 items
  30. Rail Panel 6 items
  31. Rail Section 2 items
  32. Recoil Spring 1 item
  33. Retainer Pin 4 items
  34. Safety Selector 2 items
  35. Shim Set 2 items
  36. Sight Post 4 items
  37. Spring 5 items
  38. Stock Accessory 6 items
  39. Stock Adapter 1 item
  40. Take Down / Pivot Pins 3 items
  41. Trigger / Hammer Pins 2 items
  42. Trigger Guard 2 items
  43. Upper Parts Kit 1 item
  44. Vertical Grip 6 items
Rail Length
  1. 12" 2 items
Size
  1. Medium 1 item
  2. Large 1 item
  3. 3 Slot 2 items
  4. 5 Slot 2 items
  5. 7 Slot 1 item
  6. 9 Slot 3 items
Thread Pitch
  1. 1/2x28 (.22 cal) 1 item
  2. 3/4x24 1 item
  3. 5/8x24 (.30 cal) 1 item
Stock Status
  1. In stock 102 items
  2. Out of stock 34 items
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